Beejive. At this point, they have pretty much ironed out every bug, and it has features some of the other IM apps may never see (direct IM photo sharing, voice recording upload, sharing videos from the 3G S). Not to mention, it is by far the NICEST looking IM app, and appears identical to the Text Message application.

I'll put in my $.02 for Trillian Astra, though it's not publically available yet.

If you're looking to purchase an IM app, I'd say wait until it's available and look further into it. I believe they may even have a trial/freeware version like they have with many of their other versions.

trillian already sold out there beta spots. they are limited to whatever Apples Developer terms are. we have no expected release on a final launch. and from what ive seen about the features....beejive is still better. i bought beejive when it first came out at $20. i have not once regretted my decission. the ONLY thing it lacks at this time is group conversations. thats it.

To add to the beejive love, for almost a year Beejive was $16 in a market of free/$0.99 apps and still managed to stay in the top 10 paid apps of social networking. Since it came out, it has never dropped from there

BeejiveIM... Is worth every penny. Yes it is a bit more costly vs IM+ and others but the UI is amazing and very friendly. Plus the support forum helps. They constantly come out with updates, it doesnt disconnect you as often or even at all compared to IM+. Dont be a cheapo, pay for it, you will not regret it. This will be the ONE app you always use, so dont cheat them and buy it.